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  4. Be2+ is isoelectronic with which of the following ions?

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Q. $Be^{2+}$ is isoelectronic with which of the following ions?

AIPMTAIPMT 2014Chemical Bonding and Molecular Structure

Solution:

Isoelectronic species contain same number of electrons. $Be ^{2+}$ contains $2$ electrons.
Among the given options, orily $Li ^{+}$contains $2$ electrons and therefore, it is isoelectronic with $Be ^{2+}$.
$H ^{+} \rightarrow $ no electron, $ Na ^{+} \rightarrow 10 e^{-}$
$Li ^{+} \rightarrow 2 e^{-} $
$Mg ^{2+} \rightarrow 10 e^{-}$
Hence, $Be ^{2+}$ is isoelectronic with $Li ^{+}$.